 In addition to Pali, Sinhalese, Sanskrit, Tibetan, Chinese, Japanese, English, German, Russian, and Hindi, there were those languages he studied 'for enjoyment' – Hebrew, Greek, Latin, Arabic, Spanish, and Italian.He progressed to teaching and taught at Vienna University from 1943 to 1950.Guenther left in 1950, refusing to serve under the rehabilitated ex-Nazi, Erich Frauwallner, whose academic chair had been restored to him.